The Design Of Highly Capacious Phonetic Recording Instrument Based On IDE Hard Disk

With the rapid development of the economy of our country, Many vocations, such as the Police Department, the Railway System, the Civil Aviation, the finance system and so on, need more and more telephone phonetic recording equipment urgently. Moreover voice information needs to restore for several months, even more than one year. At present, the large capacity phonetic recording instrument is based on PC, whose cubage is large and cost is much. IDE hard disk have the advantages of large capacity, high intelligentized interface and convenient control. It can be the memory medium of the large capacity phonetic recording instrument.The phonetic recording instrument of large capacity based on IDE hard disk has been implemented in this paper; The TRUESPEECH compression algorithm (namely G.723.1 protocol) has been analyzed and studied, which has been used to compress the speech; On the basis of whole design, the phonetic recording instrument has been designed including the hardware design and software programming by C51; The anti-jamming measures is used to improve the dependence of the instrument from software and hardware ; Finally, the instrument is accomplished after debug and experiment.The connectedly record and voice playback can be realized in this recording phonetic instrument respectively or simultaneity; The long-distance control telephone interface is reassigned; And several functions are achieved, such as system time display, status information etc. The keyboard can control the instrument. As the features on large capability, long time record, reliability, small volume and cost less etc can satisfied users demand, this recording phonetic instrument will have a widely future.